ac_cxx_member_templates

If the compiler supports member templates, define HAVE_MEMBER_TEMPLATES.

AC_DEFUN([AC_CXX_MEMBER_TEMPLATES],
[AC_CACHE_CHECK(whether the compiler supports member templates,
ac_cv_cxx_member_templates,
[AC_LANG_SAVE
 AC_LANG_CPLUSPLUS
 AC_TRY_COMPILE([
template<class T, int N> class A
{ public:
  template<int N2> A<T,N> operator=(const A<T,N2>& z) { return A<T,N>(); }
};],[A<double,4> x; A<double,7> y; x = y; return 0;],
 ac_cv_cxx_member_templates=yes, ac_cv_cxx_member_templates=no)
 AC_LANG_RESTORE
])
if test "$ac_cv_cxx_member_templates" = yes; then
  AC_DEFINE(HAVE_MEMBER_TEMPLATES,,[define if the compiler supports member templates])
fi
])